What would I call the most important front of this war? A call to ordinary Russians. Explaining to them how wrong is this war. That Putin has been lying to them for decades. There were no Ukrainian Nazis who were persecuting the Russian population in 2014. Russia wasn't forced to start the war. NATO doesn't "expand" as a self-conscious organism or by the will of the USA (heck, Trump would even happily back out of it!) - on the contrary, individual countries join it so that they don't share the fate of Ukraine. If all Russians understand what happened and Putin has no support, there will be less reason to continue this inhuman activity, also by his successors. But if Russian themselves are supporting the war, there is no hope of stopping it.
I would recommend you to watch this interview https://youtu.be/6xIeLJGcpfU. Alexander Shtefanov is not Welcomed by bot Ukrainians and Russian “patriots” because he reveals truth unpleasant for both sides
Companies only see the next quarter, Russia brings money to quarter, profitable quarter brings stock options and bonuses.
PR cost of doing business in Russia is smaller than effect of stock options bonuses on C-staff.
Companies stay in Russia.